FR57031E - Improvements to projection devices - Google Patents

Improvements to projection devices

Info

Publication number
FR57031E
FR57031E FR57031DA FR57031E FR 57031 E FR57031 E FR 57031E FR 57031D A FR57031D A FR 57031DA FR 57031 E FR57031 E FR 57031E
Authority
FR
France
Prior art keywords
projection devices
projection
devices
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Louis-Jean Damblanc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR57031E publication Critical patent/FR57031E/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen
    • G03B21/11—Projectors with built-in or built-on screen for microfilm reading
FR57031D 1946-08-14 1946-08-14 Improvements to projection devices Expired FR57031E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR57031T 1946-08-14

Publications (1)

Publication Number Publication Date
FR57031E true FR57031E (en) 1952-10-21

Family

ID=8691136

Family Applications (1)

Application Number Title Priority Date Filing Date
FR57031D Expired FR57031E (en) 1946-08-14 1946-08-14 Improvements to projection devices

Country Status (1)

Country Link
FR (1) FR57031E (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535032A (en) * 1968-10-23 1970-10-20 Mitchell C Hopper Table top viewer
US3623804A (en) * 1968-10-18 1971-11-30 Francis F Spreitzer Microfilm projector apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3623804A (en) * 1968-10-18 1971-11-30 Francis F Spreitzer Microfilm projector apparatus
US3535032A (en) * 1968-10-23 1970-10-20 Mitchell C Hopper Table top viewer

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